Diamond League results: Alison dos Santos breaks 400m hurdles world record in Zurich

The mark surpassed the former benchmark and was recorded by World Athletics as the fastest time ever in the event. The New York Times and BBC both reported that Brazil’s Alison dos Santos delivered the record‑breaking run, while the meet also featured Masai Russell setting a 100‑metre world record. Worldathletics.org noted that both athletes shattered existing world marks in their disciplines, and WRAL highlighted the dual achievements as a historic moment for the competition.

No timing details for Russell’s sprint were included in the headlines, but the dual record‑breaks underscored the meet’s reputation for elite performances. Official ratification of the 400‑metre hurdles and 100‑metre sprint records has not yet been detailed in the available reports, and the timing verification processes were not described. Governing bodies are expected to confirm the marks in due course, leaving the final status of the records pending.

The pending confirmation will determine whether the times are entered into the official record books.